A bus moves 30 km in 30 minute towards north and then takes a u turn and travels the next 40 km in 60 min calculate the average speed and average velocity for the entire journey​

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.